Ch32v cleanup

[Grazfather]

• ch32v:
  • Fixed WFE and reset vector
  • switched mepc writes to CSR
  • clarified build order
  • added/explained CSRs, HPE, and mret/mred behavior.
  • Renamed qingkev4-rv32imafc.zig → qingkev4-rv32imacf.zig to match WCH naming.
• riscv32 Core:
  • Removed unused functions
  • consolidated PMP setup and m2u switch into single asm blocks.
• STM32 HAL: Cleaned comments and wrapped long lines in F103 i2c.zig and uart.zig.
• WCH DMA HAL: Renamed DmaRegs → DMA_Regs.
• Drivers: Sharp Memory LCD misc cleanup.

[github-actions]

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